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The amplitude of mood and energy level is different in every individual – sometimes a bit higher, sometimes lower, sometimes changing, and for some people rather stable. However, if the mood drops to a very deep low and there is an almost complete lack of energy, this person might be experiencing a depressive episode. Or to the contrary, if a person experiences excessive energy and feels extremely positive, this might be a manic episode. These kinds of episodes are characteristic of a type of psychiatric diseases called mood or affective disorders.